From 5e6d5157fbcb3bd0f57677f608369428a205f59d Mon Sep 17 00:00:00 2001
From: CrazyMax <1951866+crazy-max@users.noreply.github.com>
Date: Fri, 7 May 2021 21:53:30 +0200
Subject: [PATCH] Handle global expressions (#71)

Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>
---
 README.md              |  20 +++++
 __tests__/meta.test.ts |  62 +++++++++++++++-
 dist/index.js          | 159 ++++++++++++++-------------------------
 src/meta.ts            | 164 ++++++++++++++---------------------------
 4 files changed, 194 insertions(+), 211 deletions(-)

diff --git a/README.md b/README.md
index d53c0527e..64285abde 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,7 @@ ___
   * [`type=sha`](#typesha)
 * [Notes](#notes)
   * [Latest tag](#latest-tag)
+  * [Global expressions](#global-expressions)
   * [Overwrite labels](#overwrite-labels)
 * [Keep up-to-date with GitHub Dependabot](#keep-up-to-date-with-github-dependabot)
 * [Contributing](#contributing)
@@ -554,6 +555,25 @@ tags: |
 * [`type=semver,pattern=...`](#typesemver)
 * [`type=match,pattern=...`](#typematch)
 
+### Global expressions
+
+The following [Handlebars template](https://handlebarsjs.com/guide/) expressions for `prefix`, `suffix` and `value`
+attributes are available:
+
+| Expression               | Output               |
+|--------------------------|----------------------|
+| `{{branch}}`             | `master`             |
+| `{{tag}}`                | `v1.2.3`             |
+| `{{sha}}`                | `90dd603`            |
+
+```yaml
+tags: |
+  # dynamically set the branch name as a prefix
+  type=sha,prefix={{branch}}-
+  # dynamically set the branch name and sha as a custom tag
+  type=raw,value=mytag-{{branch}}-{{sha}}
+```
+
 ### Overwrite labels
 
 If some of the [OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/master/annotations.md)
diff --git a/__tests__/meta.test.ts b/__tests__/meta.test.ts
index e815847e3..9fbb40e92 100644
--- a/__tests__/meta.test.ts
+++ b/__tests__/meta.test.ts
@@ -89,7 +89,8 @@ describe('null', () => {
       {
         images: ['user/app'],
         tags: [
-          `type=sha`
+          `type=sha`,
+          `type=raw,{{branch}}`,
         ]
       } as Inputs,
       {
@@ -586,6 +587,36 @@ describe('push', () => {
         "org.opencontainers.image.revision=90dd6032fac8bda1b6c4436a2e65de27961ed071",
         "org.opencontainers.image.licenses=MIT"
       ]
+    ],
+    [
+      'push17',
+      'event_push_defbranch.env',
+      {
+        images: ['user/app'],
+        tags: [
+          `type=raw,value=mytag-{{branch}}`,
+          `type=raw,value=mytag-{{tag}}`
+        ],
+      } as Inputs,
+      {
+        main: 'mytag-master',
+        partial: ['mytag-'],
+        latest: false
+      } as Version,
+      [
+        'user/app:mytag-master',
+        'user/app:mytag-'
+      ],
+      [
+        "org.opencontainers.image.title=Hello-World",
+        "org.opencontainers.image.description=This your first repo!",
+        "org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+        "org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+        "org.opencontainers.image.version=mytag-master",
+        "org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+        "org.opencontainers.image.revision=90dd6032fac8bda1b6c4436a2e65de27961ed071",
+        "org.opencontainers.image.licenses=MIT"
+      ]
     ]
   ])('given %p with %p event', tagsLabelsTest);
 });
@@ -1210,6 +1241,35 @@ describe('tag', () => {
         "org.opencontainers.image.revision=90dd6032fac8bda1b6c4436a2e65de27961ed071",
         "org.opencontainers.image.licenses=MIT"
       ]
+    ],
+    [
+      'tag20',
+      'event_tag_v1.1.1.env',
+      {
+        images: ['org/app', 'ghcr.io/user/app'],
+        tags: [
+          `type=raw,{{tag}}-{{sha}}-foo`
+        ]
+      } as Inputs,
+      {
+        main: 'v1.1.1-90dd603-foo',
+        partial: [],
+        latest: false
+      } as Version,
+      [
+        'org/app:v1.1.1-90dd603-foo',
+        'ghcr.io/user/app:v1.1.1-90dd603-foo'
+      ],
+      [
+        "org.opencontainers.image.title=Hello-World",
+        "org.opencontainers.image.description=This your first repo!",
+        "org.opencontainers.image.url=https://github.com/octocat/Hello-World",
+        "org.opencontainers.image.source=https://github.com/octocat/Hello-World",
+        "org.opencontainers.image.version=v1.1.1-90dd603-foo",
+        "org.opencontainers.image.created=2020-01-10T00:30:00.000Z",
+        "org.opencontainers.image.revision=90dd6032fac8bda1b6c4436a2e65de27961ed071",
+        "org.opencontainers.image.licenses=MIT"
+      ]
     ]
   ])('given %p with %p event', tagsLabelsTest);
 });
diff --git a/dist/index.js b/dist/index.js
index ed5b6d508..3ef66efa6 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -393,7 +393,7 @@ class Meta {
             latest: undefined
         };
         for (const tag of this.tags) {
-            if (tag.attrs['enable'] == 'false') {
+            if (!/true/i.test(tag.attrs['enable'])) {
                 continue;
             }
             switch (tag.type) {
@@ -446,21 +446,12 @@ class Meta {
             return version;
         }
         const currentDate = this.date;
-        const vraw = this.setFlavor(handlebars.compile(tag.attrs['pattern'])({
+        const vraw = this.setValue(handlebars.compile(tag.attrs['pattern'])({
             date: function (format) {
                 return moment_1.default(currentDate).utc().format(format);
             }
         }), tag);
-        if (version.main == undefined) {
-            version.main = vraw;
-        }
-        else if (vraw !== version.main) {
-            version.partial.push(vraw);
-        }
-        if (version.latest == undefined) {
-            version.latest = this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true';
-        }
-        return version;
+        return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true');
     }
     procSemver(version, tag) {
         if (!/^refs\/tags\//.test(this.context.ref) && tag.attrs['value'].length == 0) {
@@ -468,7 +459,7 @@ class Meta {
         }
         let vraw;
         if (tag.attrs['value'].length > 0) {
-            vraw = tag.attrs['value'];
+            vraw = this.setGlobalExp(tag.attrs['value']);
         }
         else {
             vraw = this.context.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-');
@@ -482,22 +473,13 @@ class Meta {
             includePrerelease: true
         });
         if (semver.prerelease(vraw)) {
-            vraw = this.setFlavor(handlebars.compile('{{version}}')(sver), tag);
+            vraw = this.setValue(handlebars.compile('{{version}}')(sver), tag);
         }
         else {
-            vraw = this.setFlavor(handlebars.compile(tag.attrs['pattern'])(sver), tag);
+            vraw = this.setValue(handlebars.compile(tag.attrs['pattern'])(sver), tag);
             latest = true;
         }
-        if (version.main == undefined) {
-            version.main = vraw;
-        }
-        else if (vraw !== version.main) {
-            version.partial.push(vraw);
-        }
-        if (version.latest == undefined) {
-            version.latest = this.flavor.latest == 'auto' ? latest : this.flavor.latest == 'true';
-        }
-        return version;
+        return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? latest : this.flavor.latest == 'true');
     }
     procMatch(version, tag) {
         if (!/^refs\/tags\//.test(this.context.ref) && tag.attrs['value'].length == 0) {
@@ -505,7 +487,7 @@ class Meta {
         }
         let vraw;
         if (tag.attrs['value'].length > 0) {
-            vraw = tag.attrs['value'];
+            vraw = this.setGlobalExp(tag.attrs['value']);
         }
         else {
             vraw = this.context.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-');
@@ -527,66 +509,29 @@ class Meta {
             core.warning(`Group ${tag.attrs['group']} does not exist for ${tag.attrs['pattern']} pattern.`);
             return version;
         }
-        vraw = this.setFlavor(tmatch[tag.attrs['group']], tag);
-        latest = true;
-        if (version.main == undefined) {
-            version.main = vraw;
-        }
-        else if (vraw !== version.main) {
-            version.partial.push(vraw);
-        }
-        if (version.latest == undefined) {
-            version.latest = this.flavor.latest == 'auto' ? latest : this.flavor.latest == 'true';
-        }
-        return version;
+        vraw = this.setValue(tmatch[tag.attrs['group']], tag);
+        return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? true : this.flavor.latest == 'true');
     }
     procRefBranch(version, tag) {
         if (!/^refs\/heads\//.test(this.context.ref)) {
             return version;
         }
-        const vraw = this.setFlavor(this.context.ref.replace(/^refs\/heads\//g, '').replace(/[^a-zA-Z0-9._-]+/g, '-'), tag);
-        if (version.main == undefined) {
-            version.main = vraw;
-        }
-        else if (vraw !== version.main) {
-            version.partial.push(vraw);
-        }
-        if (version.latest == undefined) {
-            version.latest = this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true';
-        }
-        return version;
+        const vraw = this.setValue(this.context.ref.replace(/^refs\/heads\//g, '').replace(/[^a-zA-Z0-9._-]+/g, '-'), tag);
+        return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true');
     }
     procRefTag(version, tag) {
         if (!/^refs\/tags\//.test(this.context.ref)) {
             return version;
         }
-        const vraw = this.setFlavor(this.context.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-'), tag);
-        if (version.main == undefined) {
-            version.main = vraw;
-        }
-        else if (vraw !== version.main) {
-            version.partial.push(vraw);
-        }
-        if (version.latest == undefined) {
-            version.latest = this.flavor.latest == 'auto' ? true : this.flavor.latest == 'true';
-        }
-        return version;
+        const vraw = this.setValue(this.context.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-'), tag);
+        return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? true : this.flavor.latest == 'true');
     }
     procRefPr(version, tag) {
         if (!/^refs\/pull\//.test(this.context.ref)) {
             return version;
         }
-        const vraw = this.setFlavor(this.context.ref.replace(/^refs\/pull\//g, '').replace(/\/merge$/g, ''), tag);
-        if (version.main == undefined) {
-            version.main = vraw;
-        }
-        else if (vraw !== version.main) {
-            version.partial.push(vraw);
-        }
-        if (version.latest == undefined) {
-            version.latest = this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true';
-        }
-        return version;
+        const vraw = this.setValue(this.context.ref.replace(/^refs\/pull\//g, '').replace(/\/merge$/g, ''), tag);
+        return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true');
     }
     procEdge(version, tag) {
         if (!/^refs\/heads\//.test(this.context.ref)) {
@@ -599,62 +544,70 @@ class Meta {
         if (tag.attrs['branch'] === val) {
             val = 'edge';
         }
-        const vraw = this.setFlavor(val, tag);
-        if (version.main == undefined) {
-            version.main = vraw;
-        }
-        else if (vraw !== version.main) {
-            version.partial.push(vraw);
-        }
-        if (version.latest == undefined) {
-            version.latest = this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true';
-        }
-        return version;
+        const vraw = this.setValue(val, tag);
+        return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true');
     }
     procRaw(version, tag) {
-        const vraw = this.setFlavor(tag.attrs['value'], tag);
-        if (version.main == undefined) {
-            version.main = vraw;
-        }
-        else if (vraw !== version.main) {
-            version.partial.push(vraw);
-        }
-        if (version.latest == undefined) {
-            version.latest = this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true';
-        }
-        return version;
+        const vraw = this.setValue(this.setGlobalExp(tag.attrs['value']), tag);
+        return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true');
     }
     procSha(version, tag) {
         if (!this.context.sha) {
             return version;
         }
-        const vraw = this.setFlavor(this.context.sha.substr(0, 7), tag);
+        const vraw = this.setValue(this.context.sha.substr(0, 7), tag);
+        return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true');
+    }
+    static setVersion(version, val, latest) {
+        if (val.length == 0) {
+            return version;
+        }
         if (version.main == undefined) {
-            version.main = vraw;
+            version.main = val;
         }
-        else if (vraw !== version.main) {
-            version.partial.push(vraw);
+        else if (val !== version.main) {
+            version.partial.push(val);
         }
         if (version.latest == undefined) {
-            version.latest = this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true';
+            version.latest = latest;
         }
         return version;
     }
-    setFlavor(val, tag) {
+    setValue(val, tag) {
         if (tag.attrs.hasOwnProperty('prefix')) {
-            val = `${tag.attrs['prefix']}${val}`;
+            val = `${this.setGlobalExp(tag.attrs['prefix'])}${val}`;
         }
         else if (this.flavor.prefix.length > 0) {
-            val = `${this.flavor.prefix}${val}`;
+            val = `${this.setGlobalExp(this.flavor.prefix)}${val}`;
         }
         if (tag.attrs.hasOwnProperty('suffix')) {
-            val = `${val}${tag.attrs['suffix']}`;
+            val = `${val}${this.setGlobalExp(tag.attrs['suffix'])}`;
         }
         else if (this.flavor.suffix.length > 0) {
-            val = `${val}${this.flavor.suffix}`;
+            val = `${val}${this.setGlobalExp(this.flavor.suffix)}`;
         }
         return val;
     }
+    setGlobalExp(val) {
+        const ctx = this.context;
+        return handlebars.compile(val)({
+            branch: function () {
+                if (!/^refs\/heads\//.test(ctx.ref)) {
+                    return '';
+                }
+                return ctx.ref.replace(/^refs\/heads\//g, '').replace(/[^a-zA-Z0-9._-]+/g, '-');
+            },
+            tag: function () {
+                if (!/^refs\/tags\//.test(ctx.ref)) {
+                    return '';
+                }
+                return ctx.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-');
+            },
+            sha: function () {
+                return ctx.sha.substr(0, 7);
+            }
+        });
+    }
     getTags() {
         if (!this.version.main) {
             return [];
diff --git a/src/meta.ts b/src/meta.ts
index e16ec9027..a0b1daaf5 100644
--- a/src/meta.ts
+++ b/src/meta.ts
@@ -44,7 +44,7 @@ export class Meta {
     };
 
     for (const tag of this.tags) {
-      if (tag.attrs['enable'] == 'false') {
+      if (!/true/i.test(tag.attrs['enable'])) {
         continue;
       }
       switch (tag.type) {
@@ -99,7 +99,7 @@ export class Meta {
     }
 
     const currentDate = this.date;
-    const vraw = this.setFlavor(
+    const vraw = this.setValue(
       handlebars.compile(tag.attrs['pattern'])({
         date: function (format) {
           return moment(currentDate).utc().format(format);
@@ -108,16 +108,7 @@ export class Meta {
       tag
     );
 
-    if (version.main == undefined) {
-      version.main = vraw;
-    } else if (vraw !== version.main) {
-      version.partial.push(vraw);
-    }
-    if (version.latest == undefined) {
-      version.latest = this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true';
-    }
-
-    return version;
+    return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true');
   }
 
   private procSemver(version: Version, tag: tcl.Tag): Version {
@@ -127,7 +118,7 @@ export class Meta {
 
     let vraw: string;
     if (tag.attrs['value'].length > 0) {
-      vraw = tag.attrs['value'];
+      vraw = this.setGlobalExp(tag.attrs['value']);
     } else {
       vraw = this.context.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-');
     }
@@ -141,21 +132,13 @@ export class Meta {
       includePrerelease: true
     });
     if (semver.prerelease(vraw)) {
-      vraw = this.setFlavor(handlebars.compile('{{version}}')(sver), tag);
+      vraw = this.setValue(handlebars.compile('{{version}}')(sver), tag);
     } else {
-      vraw = this.setFlavor(handlebars.compile(tag.attrs['pattern'])(sver), tag);
+      vraw = this.setValue(handlebars.compile(tag.attrs['pattern'])(sver), tag);
       latest = true;
     }
-    if (version.main == undefined) {
-      version.main = vraw;
-    } else if (vraw !== version.main) {
-      version.partial.push(vraw);
-    }
-    if (version.latest == undefined) {
-      version.latest = this.flavor.latest == 'auto' ? latest : this.flavor.latest == 'true';
-    }
 
-    return version;
+    return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? latest : this.flavor.latest == 'true');
   }
 
   private procMatch(version: Version, tag: tcl.Tag): Version {
@@ -165,7 +148,7 @@ export class Meta {
 
     let vraw: string;
     if (tag.attrs['value'].length > 0) {
-      vraw = tag.attrs['value'];
+      vraw = this.setGlobalExp(tag.attrs['value']);
     } else {
       vraw = this.context.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-');
     }
@@ -187,73 +170,32 @@ export class Meta {
       return version;
     }
 
-    vraw = this.setFlavor(tmatch[tag.attrs['group']], tag);
-    latest = true;
-
-    if (version.main == undefined) {
-      version.main = vraw;
-    } else if (vraw !== version.main) {
-      version.partial.push(vraw);
-    }
-    if (version.latest == undefined) {
-      version.latest = this.flavor.latest == 'auto' ? latest : this.flavor.latest == 'true';
-    }
-
-    return version;
+    vraw = this.setValue(tmatch[tag.attrs['group']], tag);
+    return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? true : this.flavor.latest == 'true');
   }
 
   private procRefBranch(version: Version, tag: tcl.Tag): Version {
     if (!/^refs\/heads\//.test(this.context.ref)) {
       return version;
     }
-
-    const vraw = this.setFlavor(this.context.ref.replace(/^refs\/heads\//g, '').replace(/[^a-zA-Z0-9._-]+/g, '-'), tag);
-    if (version.main == undefined) {
-      version.main = vraw;
-    } else if (vraw !== version.main) {
-      version.partial.push(vraw);
-    }
-    if (version.latest == undefined) {
-      version.latest = this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true';
-    }
-
-    return version;
+    const vraw = this.setValue(this.context.ref.replace(/^refs\/heads\//g, '').replace(/[^a-zA-Z0-9._-]+/g, '-'), tag);
+    return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true');
   }
 
   private procRefTag(version: Version, tag: tcl.Tag): Version {
     if (!/^refs\/tags\//.test(this.context.ref)) {
       return version;
     }
-
-    const vraw = this.setFlavor(this.context.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-'), tag);
-    if (version.main == undefined) {
-      version.main = vraw;
-    } else if (vraw !== version.main) {
-      version.partial.push(vraw);
-    }
-    if (version.latest == undefined) {
-      version.latest = this.flavor.latest == 'auto' ? true : this.flavor.latest == 'true';
-    }
-
-    return version;
+    const vraw = this.setValue(this.context.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-'), tag);
+    return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? true : this.flavor.latest == 'true');
   }
 
   private procRefPr(version: Version, tag: tcl.Tag): Version {
     if (!/^refs\/pull\//.test(this.context.ref)) {
       return version;
     }
-
-    const vraw = this.setFlavor(this.context.ref.replace(/^refs\/pull\//g, '').replace(/\/merge$/g, ''), tag);
-    if (version.main == undefined) {
-      version.main = vraw;
-    } else if (vraw !== version.main) {
-      version.partial.push(vraw);
-    }
-    if (version.latest == undefined) {
-      version.latest = this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true';
-    }
-
-    return version;
+    const vraw = this.setValue(this.context.ref.replace(/^refs\/pull\//g, '').replace(/\/merge$/g, ''), tag);
+    return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true');
   }
 
   private procEdge(version: Version, tag: tcl.Tag): Version {
@@ -269,65 +211,73 @@ export class Meta {
       val = 'edge';
     }
 
-    const vraw = this.setFlavor(val, tag);
-    if (version.main == undefined) {
-      version.main = vraw;
-    } else if (vraw !== version.main) {
-      version.partial.push(vraw);
-    }
-    if (version.latest == undefined) {
-      version.latest = this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true';
-    }
-
-    return version;
+    const vraw = this.setValue(val, tag);
+    return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true');
   }
 
   private procRaw(version: Version, tag: tcl.Tag): Version {
-    const vraw = this.setFlavor(tag.attrs['value'], tag);
-    if (version.main == undefined) {
-      version.main = vraw;
-    } else if (vraw !== version.main) {
-      version.partial.push(vraw);
-    }
-    if (version.latest == undefined) {
-      version.latest = this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true';
-    }
-
-    return version;
+    const vraw = this.setValue(this.setGlobalExp(tag.attrs['value']), tag);
+    return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true');
   }
 
   private procSha(version: Version, tag: tcl.Tag): Version {
     if (!this.context.sha) {
       return version;
     }
+    const vraw = this.setValue(this.context.sha.substr(0, 7), tag);
+    return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true');
+  }
 
-    const vraw = this.setFlavor(this.context.sha.substr(0, 7), tag);
+  private static setVersion(version: Version, val: string, latest: boolean): Version {
+    if (val.length == 0) {
+      return version;
+    }
     if (version.main == undefined) {
-      version.main = vraw;
-    } else if (vraw !== version.main) {
-      version.partial.push(vraw);
+      version.main = val;
+    } else if (val !== version.main) {
+      version.partial.push(val);
     }
     if (version.latest == undefined) {
-      version.latest = this.flavor.latest == 'auto' ? false : this.flavor.latest == 'true';
+      version.latest = latest;
     }
-
     return version;
   }
 
-  private setFlavor(val: string, tag: tcl.Tag): string {
+  private setValue(val: string, tag: tcl.Tag): string {
     if (tag.attrs.hasOwnProperty('prefix')) {
-      val = `${tag.attrs['prefix']}${val}`;
+      val = `${this.setGlobalExp(tag.attrs['prefix'])}${val}`;
     } else if (this.flavor.prefix.length > 0) {
-      val = `${this.flavor.prefix}${val}`;
+      val = `${this.setGlobalExp(this.flavor.prefix)}${val}`;
     }
     if (tag.attrs.hasOwnProperty('suffix')) {
-      val = `${val}${tag.attrs['suffix']}`;
+      val = `${val}${this.setGlobalExp(tag.attrs['suffix'])}`;
     } else if (this.flavor.suffix.length > 0) {
-      val = `${val}${this.flavor.suffix}`;
+      val = `${val}${this.setGlobalExp(this.flavor.suffix)}`;
     }
     return val;
   }
 
+  private setGlobalExp(val): string {
+    const ctx = this.context;
+    return handlebars.compile(val)({
+      branch: function () {
+        if (!/^refs\/heads\//.test(ctx.ref)) {
+          return '';
+        }
+        return ctx.ref.replace(/^refs\/heads\//g, '').replace(/[^a-zA-Z0-9._-]+/g, '-');
+      },
+      tag: function () {
+        if (!/^refs\/tags\//.test(ctx.ref)) {
+          return '';
+        }
+        return ctx.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-');
+      },
+      sha: function () {
+        return ctx.sha.substr(0, 7);
+      }
+    });
+  }
+
   public getTags(): Array<string> {
     if (!this.version.main) {
       return [];