aboutsummaryrefslogtreecommitdiff
path: root/zsh/zshrc.d/prompt.zsh
blob: 27db61cb3850f32a0aa95cc5273b01d459a4bdee (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
# Frontend to controlling prompt
prompt() {

    # What's done next depends on the first argument to the function
    case $1 in

        # Turn complex, colored PS1 and debugging PS4 prompts on
        on)
            setopt promptsubst promptpercent

            # Basic prompt shape depends on whether we're in SSH or not
            PS1=
            if [[ -n $SSH_CLIENT ]] || [[ -n $SSH_CONNECTION ]] ; then
                PS1=$PS1'%n@%m:'
            fi
            PS1=$PS1'%~'

            # Add sub-commands; VCS, job, and return status checks
            PS1=$PS1'$(ret=$?;prompt vcs;prompt job;prompt ret)'

            # Add prefix and suffix
            PS1='${PROMPT_PREFIX}'$PS1'${PROMPT_SUFFIX}'

            # Add terminating "$" or "#" sign
            PS1=$PS1'%#'

            # Add > symbols to show nested shells
            local shlvl
            for ((shlvl = 1; shlvl < SHLVL; shlvl++)) ; do
                PS1='>'$PS1
            done

            # Bold and color the prompt if it looks like we can
            if (( $({ tput colors || tput Co ; } 2>/dev/null) >= 8 )) ; then
                PS1='%B%F{cyan}'$PS1'%f%b'
            fi

            # Add a space and define the rest of the prompts
            PS1=$PS1' '
            PS2='> '
            PS3='? '
            PS4='+<$?> $LINENO:'
            ;;

        # Revert to simple inexpensive prompts
        off)
            PS1='\$ '
            PS2='> '
            PS3='? '
            PS4='+ '
            ;;

        # Git prompt function
        git)

            # Wrap as compound command; we don't want to see output from any of
            # these git(1) calls
            {
                # Bail if we're not in a work tree--or, implicitly, if we don't
                # have git(1).
                [[ $(git rev-parse --is-inside-work-tree) == true ]] ||
                    return

                # Refresh index so e.g. git-diff-files(1) is accurate
                git update-index --refresh

                # Find a local branch, remote branch, or tag (annotated or
                # not), or failing all of that just show the short commit ID,
                # in that order of preference; if none of that works, bail out
                local name
                name=$(
                    git symbolic-ref --quiet HEAD ||
                    git describe --tags --exact-match HEAD ||
                    git rev-parse --short HEAD
                ) || return
                name=${name##*/}
                [[ -n $name ]] || return

                # Check various files in .git to flag processes
                local proc
                [[ -d .git/rebase-merge || -d .git/rebase-apply ]] &&
                    proc=${proc:+"$proc",}'REBASE'
                [[ -f .git/MERGE_HEAD ]] &&
                    proc=${proc:+"$proc",}'MERGE'
                [[ -f .git/CHERRY_PICK_HEAD ]] &&
                    proc=${proc:+"$proc",}'PICK'
                [[ -f .git/REVERT_HEAD ]] &&
                    proc=${proc:+"$proc",}'REVERT'
                [[ -f .git/BISECT_LOG ]] &&
                    proc=${proc:+"$proc",}'BISECT'

                # Collect symbols representing repository state
                local state

                # Upstream HEAD has commits after local HEAD; we're "behind"
                (($(git rev-list --count 'HEAD..@{u}'))) &&
                    state=${state}'<'

                # Local HEAD has commits after upstream HEAD; we're "ahead"
                (($(git rev-list --count '@{u}..HEAD'))) &&
                    state=${state}'>'

                # Tracked files are modified
                git diff-files --no-ext-diff --quiet ||
                    state=${state}'!'

                # Changes are staged
                git diff-index --cached --no-ext-diff --quiet HEAD ||
                    state=${state}'+'

                # There are some untracked and unignored files
                git ls-files --directory --error-unmatch --exclude-standard \
                    --no-empty-directory --others -- ':/*' &&
                    state=${state}'?'

                # There are stashed changes
                git rev-parse --quiet --verify refs/stash &&
                    state=${state}'^'

            } >/dev/null 2>&1

            # Print the status in brackets; add a git: prefix only if there
            # might be another VCS prompt (because PROMPT_VCS is set)
            printf '(%s%s%s%s)' \
                "${PROMPT_VCS:+git:}" "$name" "${proc:+:"$proc"}" "$state"
            ;;

        # Subversion prompt function
        svn)
            # Determine the repository URL and root directory
            local key value url root
            while [[ -z $url || -z $root ]] && IFS=: read -r key value ; do
                case $key in
                    'URL') url=${value## } ;;
                    'Repository Root') root=${value## } ;;
                esac
            done < <(svn info 2>/dev/null)

            # Exit if we couldn't get either--or, implicitly, if we don't have
            # svn(1).
            [[ -n $url && -n $root ]] || return

            # Remove the root from the URL to get what's hopefully the branch
            # name, removing leading slashes and the 'branches' prefix, and any
            # trailing content after a slash
            local branch
            branch=${url/"$root"}
            branch=${branch#/}
            branch=${branch#branches/}
            branch=${branch%%/*}

            # Parse the output of svn status to determine working copy state
            local symbol
            local -i modified untracked
            while ((!modified || !untracked)) && read -r symbol _ ; do
                case $symbol in
                    *\?*) untracked=1 ;;
                    *) modified=1 ;;
                esac
            done < <(svn status 2>/dev/null)

            # Add appropriate state flags
            local state
            ((modified)) && state=${state}'!'
            ((untracked)) && state=${state}'?'

            # Print the state in brackets with an svn: prefix
            printf '(svn:%s%s)' "${branch:-unknown}" "$state"
            ;;

        # VCS wrapper prompt function; print the first relevant prompt, if any
        vcs)
            local vcs
            for vcs in "${PROMPT_VCS[@]:-git}" ; do
                prompt "$vcs" && return
            done
            ;;

        # Show return status of previous command in angle brackets, if not zero
        ret)
            ((ret)) && printf '<%u>' "$ret"
            ;;

        # Show the count of background jobs in curly brackets, if not zero
        job)
            local -i jobc
            while read -r ; do
                ((jobc++))
            done < <(jobs -p)
            ((jobc)) && printf '{%u}' "$jobc"
            ;;

        # No argument given, print prompt strings and vars
        '')
            declare -p PS1 PS2 PS3 PS4
            ;;

        # Print error
        *)
            printf 'prompt: Unknown command %s\n' "$1" >&2
            return 2
            ;;
    esac
}

# Start with full-fledged prompt
prompt on